Exhaust Pipe question

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Mofosheee

Mofosheee

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Hello

I have nothing to reference.
The pipes that came with my 73 850 have no balance pipes............. making them probably 750 pipes
Any problem using these presumably 750 pipes on an 850?

Thanks
 
You are probably better off with 750 pipes. The 850 pipes with crossovers are known to crack at the welded joint. Most folks that ride 850s have replaced their pipes with 750 pipes.
 
Mofosheee said:
making them probably 750 pipes
Click to expand...

Do they look like these (late 750, used with long lockrings and sealing washers)?...
Exhaust Pipe question


...or these 850 without balance pipe, (used with short lockrings, collets and sealing washers)?...
Exhaust Pipe question


...or these 850 Mk3 without balance pipe, (short lockrings, collets and spherical seatings)?
Exhaust Pipe question
 
Lab...................definitely the first picture (late 750, used with long lockrings and sealing washers)
 
Mofosheee said:
definitely the first picture (late 750, used with long lockrings and sealing washers)
Click to expand...

Ok, I assume it already has the long 750 exhaust lockrings...
andover-norton.co.uk

Motorcycle parts and spares for Norton motorbikes - Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts

Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Factory Spare Parts for Norton motorcycles built before 2002.
andover-norton.co.uk
...or short 850 lockrings could be used with additional sealing washers.
 
I am now onto my 4th 850, having tried most patterns of pipes S & SS as well as 750 non balanced type, I have always found the 850 balanced type smoother i.e. with a non balanced set on the 850 feels harsh.
 
The bike came as a basket case.
The ex pipes that came with the bike resemble picture #1 (posted by LAB). They are new and measure 1.375" where they meet the muffler.
The ID of the used "Dunstall" muffler where it meets the ex pipe measures 1.56" (depending upon where you measure)

Andover Norton shows no bushing to take up this space
andover-norton.co.uk

Andover Norton Parts Drawings - Andover Norton Factory Parts - Commando Parts

Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.
andover-norton.co.uk

Can anybody out in Forum world explain this. Thanks
 
As a related question, I always have questions, some exhaust pipes run close to the frame others much wider. I prefer the close to frame design. Is this a particular year or aftermarket? Thanks
 
mean gene said:
Is this a particular year or aftermarket?
Click to expand...

Exhaust Down pipes, correct angle out of head

Someone once told me that correct pre'72 down pipes had the flanges welded or pipes bent at an angle out of the head. So the pipes do not come straight out of the head like triumph pipes. Therefore he said I should keep the originals and have them rechromed. All the repros I have seen are...
www.accessnorton.com www.accessnorton.com
 
"No need for the balance tube. Plus, they suck power as proven on Dyno Hill."

I admit to having a little trouble with this since tests in the early 70's produced the opposite result and a balance tube was recommended for performance work.
 
I reckon deleting the balance tube is the way forward today, even without the Dyno hill findings. All pipes now are pattern parts and fit is often less than perfect. Adding the balance tube introduces a whole extra level of complexity to the fit. And potentially a whole extra level of failure inducing stresses.
 
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